SOURCE

var tarObj = $(".accordionMenu :target");
$("#event").append(tarObj);

<div class="accordionMenu">
  <div class="menuSection" id="brand">
    <h2><a href="#brand">Brand</a></h2>
    <p>Lorem ipsm color... 1</p>
  </div>
  <div class="menuSection" id="promotion">
    <h2><a href="#promotion">promotion</a></h2>
    <p>Lorem ipsm color...2 </p>
  </div>
  <div class="menuSection" id="event">
    <h2><a href="#event">event</a></h2>
    <p>Lorem ipsm color... 3</p>
  </div>
</div>

.accordionMenu{
  background:#Fff; color:#424242;  font:12px Arial,Verdana,sans-serif;
  margin: 0 auto; padding:10px; width:500px;
}
.accordionMenu h2{
  margin:5px 0;padding:0; position:relative;
}

.accordionMenu h2:before{
  border:5px solid #fff;
  border-color:#fff transparent transparent;
  content:""; height:0; position:absolute;
  right:10px; top:15px; width:0;
}

.accordionMenu h2 a{
  background:#8f8f8f;
  background:-moz-linear-gradient(top,#cecece,#8f8f8f);
  background:-webkit-gradient(linear,left top,left bottom,
              from(#cecece),to(#8f8f8f));
  background:-webkit-linear-gradient(top,#cecece,#8f8f8f);
  background:linear-gradient(top,#cecece,#8f8f8f);
  border-radius:5px; color:#424242;
  display:block; font-size:13px; font-weight:normal;
  margin:0; padding:10px; text-shadow:2px 2px 2px #aeaeae;
  text-decoration:none;
}
.accordionMenu :target h2 a,
.accordionMenu h2 a:focus,
.accordionMenu h2 a:hover,
.accordionMenu h2 a:active{
  background:#28d;
  background:-moz-linear-gradient(top,#6bb2ff,#28d);
  background:-webkit-gradient(linear,left top,left bottom,
              from(#6bb2ff),to(#28d));
  background:-webkit-linear-gradient(top,#6bb2ff,#28d);
  background:linear-gradient(top,#6bb2ff,#28d);
  color:#fff;
}

.accordionMenu p{
  margin:0; height:0;
   overflow:hidden;
  padding:0 10px;  
  -moz-transition:height 0.5s ease-in;
  -webkit-transition:height 0.5s ease-in;
  transition:height 0.5s ease-in;
}
.accordionMenu :target p{
  height:100px;  overflow:auto;
}
.accordionMenu :target h2:before{
  border-color:transparent transparent transparent #fff;
}